Ontologia

HydroBASINS lev08 watershed · #2080031880

Bassin de Svärtaån

A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.

Crosses 2 administrative regions : Gnesta, Nyköping

64% lakePfafstetter: 24473004

Sub-basin area

383,1km²

Upstream area

383,1km²

Discharge

2,29m³/s

Mean elev.

42m

Administrative coverage

2 dept-equivalent regions (GADM L2)

30 intersecting protected areas

  • Likstammen

    IUCN Not Assigned

    Natura 2000 SCI

    9.29 km² overlap

  • Likstammen

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    9.29 km² overlap

  • Likstammen

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    9.29 km² overlap

  • Likstammen

    IUCN Not Assigned

    Natura 2000 SPA

    9.29 km² overlap

  • 2045148 Vargmossarna

    IUCN Ia

    Nature Reserve

    3.52 km² overlap

  • 2062601 Stocksund

    IUCN Ia

    Nature Reserve

    2.22 km² overlap

  • Fräkenkärret

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    1.41 km² overlap

  • Fräkenkärret

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    1.41 km² overlap

  • Fräkenkärret

    IUCN III

    Natura 2000 SPA

    1.41 km² overlap

21 more protected areas

  • Fräkenkärret

    IUCN III

    Natura 2000 SCI

    1.41 km² overlap

  • 2001310 Fräkenkärret

    IUCN III

    Nature Reserve

    1.41 km² overlap

  • Stortrön

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    1.09 km² overlap

  • Stortrön

    IUCN Not Assigned

    Natura 2000 SCI

    1.09 km² overlap

  • 2001322 Utnäset

    IUCN IV

    Nature Reserve

    0.81 km² overlap

  • Utnäset

    IUCN IV

    Natura 2000 SPA

    0.80 km² overlap

  • Utnäset

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.80 km² overlap

  • Utnäset

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    0.80 km² overlap

  • Utnäset

    IUCN IV

    Natura 2000 SCI

    0.80 km² overlap

  • Davik

    IUCN Not Assigned

    Natura 2000 SCI

    0.63 km² overlap

  • Davik

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.63 km² overlap

  • 2002765 Timmermon

    IUCN Ia

    Nature Reserve

    0.38 km² overlap

  • 2048419 Tegelbrukshagen

    IUCN IV

    Nature Reserve

    0.31 km² overlap

  • 2001298 Storhultet

    IUCN Ia

    Nature Reserve

    0.28 km² overlap

  • Storhultet

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.28 km² overlap

  • Storhultet

    IUCN Ia

    Natura 2000 SCI

    0.28 km² overlap

  • Timmermon

    IUCN Ia

    Natura 2000 SCI

    0.25 km² overlap

  • Timmermon

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.25 km² overlap

  • 2001937 Långmossen

    IUCN Ia

    Nature Reserve

    0.22 km² overlap

  • Fräkenvassen

    IUCN Not Assigned

    Natura 2000 SCI

    0.21 km² overlap

  • Fräkenvassen

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.21 km² overlap

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

5 014 distinct species · 235 202 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

235 202 obs · 15 cellules
Obs. / cellule
≥ 76 964
24 657–76 963
14 035–24 656
11 515–14 034
< 11 515

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Ecological tissue

Sample of 28 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.

ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Bassin de Svärtaån : 19 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 86 interactions GloBI sur 5 types (connectance 19.8%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
30
Interactions affichées
86
Connectance
0.198
Patrimoniales
2
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydroclimate (BasinATLAS lev08)

Mean T°

6,6°C

Annual rain

554mm

Moisture idx (CMI)

-0,04

Runoff

203mm/an

PET

578mm

AET

420mm

Mean slope

2,6°

Water table

209cm

Forest

73%

Crops

34%

Urban

5%

Protected

1%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)